Question about RCA 36V430T 36" TV

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Dead set, HOT transistor keeps shorting

Hi i have a 36" RCA crt with itc008 board that got damaged by lightning hitting near the power line. Upon inspection, you hear a loud squealing by the primary transistor.

After further inspection, i found that the horizontal output transistor was shorted. I replaced that HOT and it shorted again immediately.

with the HOT out: the set cycles, with it in: the set appears completely dead. Could these be caused by a high reg b+ voltage?? Any ideas at all, please help.

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  • 5 more comments 
  • R E Dec 21, 2008

    is the yoke the circuit coming out of the tube or the glass part?

  • R E Dec 21, 2008

    reg B+ is near 250V, will replace ip050. do u know wheres the best place to get this part online? thanks for your help

  • R E Dec 21, 2008

    thanks but is way cheaper

  • R E Dec 21, 2008

    thanks but is way cheaper

  • R E Feb 11, 2009

    replaced all actice components on power supply. reconnected everything and got 130V at collector of HOT, can hear the static on the crt but not starting up, then HOT shorted again :(

    any ideas, i know its not power supply, now it has to be yoke circuit, e/w correction block or horizontal circuits, thank you

  • R E Feb 11, 2009
  • William Rayburn
    William Rayburn May 11, 2010

    If it was hit the surge could have damaged the yoke which is bonded and not worth the repair... Check your B+ on the collector of the hot - if higher than 130v it's either the yoke or regulator Ip050 p/n 231525....



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  • Master
  • 934 Answers

It's the copper coiled magnet on the neck of the crt closest to the front of the tube.

Posted on Dec 21, 2008

  • 1 more comment 
  • William Rayburn
    William Rayburn Dec 21, 2008

    Try Vance Baldwin just sign in as a guest...

  • William Rayburn
    William Rayburn Dec 21, 2008

    Mouser is okay also - some times they don't always have the more specific parts on-hand, but if you found one there that's great...

  • William Rayburn
    William Rayburn Feb 11, 2009

    Did you also replace the Horizontal Damper Diode, DL021, P/N 242907 ? I'd suspect that if the damper was okay you might have a bad Ihvt, LL005, P/N 262343 and you could possibly use an ASTI or HR Diemen replacement for something less expensive.

    Then again, could be the yoke. The way you could test that theory is unplug the yoke at the main board and after replacing the HOT again fire it up and see if it blows the transistor again. If it does it's not the yoke...

    BTW: you might consider using a 2sd1881 for a HOT they're a little less expensive than OEM...



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